The Samson SRK Pro 19 inch. universal equipment racks are constructed of commercial-grade cold rolled steel with fully enclosed side panels, as well as adjustable (4-position) front and rear rack rails that offer a highly accommodating maximum depth of 24 inch.. The top and side panels feature perforations for passive ventilation, while the top and bottom panels include knockouts for wiring accessibility. The racks can be set upon the included casters for easy transport or the included rack feet for fixed installation. Either way, these racks can handle a weight capacity of up to 440lb. In addition, their unique steel support bar design allows these racks to work with U.S. or European screw thread sizes (hardware included). Lastly, the SRK Pro Racks are made specifically to fit Samson's SRK Pro Metal and Plexi Rack Doors (sold separately) on both their front and back panels. SRKPRO8: 8-space rack (19 inch. [21.75 inch. with casters] x 22.75 inch. x 24 inch.)